ESPN believed that the average age of Sportszone visitors was 29 years old. To test this...

ESPN believed that the average age of Sportszone visitors was 29 years old. To test this hypothesis, it collected audience profile data at the ESPN SportsZone Web site and found that a typical user of the website was 25 years of age (i.e., sample mean = 25) with a standard deviation of 5. Assume that this sample value was based on a sample of 400 users. Test its hypothesis using 99% confidence level.

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orchestra answered 2 years ago

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